1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
4 */
5
6 #include <linux/iio/iio.h>
7 #include <linux/interrupt.h>
8 #include <linux/io.h>
9 #include <linux/mfd/core.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/property.h>
13
14 #include "ssp.h"
15
16 #define SSP_WDT_TIME 10000
17 #define SSP_LIMIT_RESET_CNT 20
18 #define SSP_LIMIT_TIMEOUT_CNT 3
19
20 /* It is possible that it is max clk rate for version 1.0 of bootcode */
21 #define SSP_BOOT_SPI_HZ 400000
22
23 /*
24 * These fields can look enigmatic but this structure is used mainly to flat
25 * some values and depends on command type.
26 */
27 struct ssp_instruction {
28 __le32 a;
29 __le32 b;
30 u8 c;
31 } __attribute__((__packed__));
32
33 static const u8 ssp_magnitude_table[] = {110, 85, 171, 71, 203, 195, 0, 67,
34 208, 56, 175, 244, 206, 213, 0, 92, 250, 0, 55, 48, 189, 252, 171,
35 243, 13, 45, 250};
36
37 static const struct ssp_sensorhub_info ssp_rinato_info = {
38 .fw_name = "ssp_B2.fw",
39 .fw_crashed_name = "ssp_crashed.fw",
40 .fw_rev = 14052300,
41 .mag_table = ssp_magnitude_table,
42 .mag_length = ARRAY_SIZE(ssp_magnitude_table),
43 };
44
45 static const struct ssp_sensorhub_info ssp_thermostat_info = {
46 .fw_name = "thermostat_B2.fw",
47 .fw_crashed_name = "ssp_crashed.fw",
48 .fw_rev = 14080600,
49 .mag_table = ssp_magnitude_table,
50 .mag_length = ARRAY_SIZE(ssp_magnitude_table),
51 };
52
53 static const struct mfd_cell sensorhub_sensor_devs[] = {
54 {
55 .name = "ssp-accelerometer",
56 },
57 {
58 .name = "ssp-gyroscope",
59 },
60 };
61
ssp_toggle_mcu_reset_gpio(struct ssp_data * data)62 static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data)
63 {
64 gpiod_set_value(data->mcu_reset_gpiod, 0);
65 usleep_range(1000, 1200);
66 gpiod_set_value(data->mcu_reset_gpiod, 1);
67 msleep(50);
68 }
69
ssp_sync_available_sensors(struct ssp_data * data)70 static void ssp_sync_available_sensors(struct ssp_data *data)
71 {
72 int i, ret;
73
74 for (i = 0; i < SSP_SENSOR_MAX; ++i) {
75 if (data->available_sensors & BIT(i)) {
76 ret = ssp_enable_sensor(data, i, data->delay_buf[i]);
77 if (ret < 0) {
78 dev_err(&data->spi->dev,
79 "Sync sensor nr: %d fail\n", i);
80 continue;
81 }
82 }
83 }
84
85 ret = ssp_command(data, SSP_MSG2SSP_AP_MCU_SET_DUMPMODE,
86 data->mcu_dump_mode);
87 if (ret < 0)
88 dev_err(&data->spi->dev,
89 "SSP_MSG2SSP_AP_MCU_SET_DUMPMODE failed\n");
90 }
91
ssp_enable_mcu(struct ssp_data * data,bool enable)92 static void ssp_enable_mcu(struct ssp_data *data, bool enable)
93 {
94 dev_info(&data->spi->dev, "current shutdown = %d, old = %d\n", enable,
95 data->shut_down);
96
97 if (enable && data->shut_down) {
98 data->shut_down = false;
99 enable_irq(data->spi->irq);
100 enable_irq_wake(data->spi->irq);
101 } else if (!enable && !data->shut_down) {
102 data->shut_down = true;
103 disable_irq(data->spi->irq);
104 disable_irq_wake(data->spi->irq);
105 } else {
106 dev_warn(&data->spi->dev, "current shutdown = %d, old = %d\n",
107 enable, data->shut_down);
108 }
109 }
110
111 /*
112 * This function is the first one which communicates with the mcu so it is
113 * possible that the first attempt will fail
114 */
ssp_check_fwbl(struct ssp_data * data)115 static int ssp_check_fwbl(struct ssp_data *data)
116 {
117 int retries = 0;
118
119 while (retries++ < 5) {
120 data->cur_firm_rev = ssp_get_firmware_rev(data);
121 if (data->cur_firm_rev == SSP_INVALID_REVISION ||
122 data->cur_firm_rev == SSP_INVALID_REVISION2) {
123 dev_warn(&data->spi->dev,
124 "Invalid revision, trying %d time\n", retries);
125 } else {
126 break;
127 }
128 }
129
130 if (data->cur_firm_rev == SSP_INVALID_REVISION ||
131 data->cur_firm_rev == SSP_INVALID_REVISION2) {
132 dev_err(&data->spi->dev, "SSP_INVALID_REVISION\n");
133 return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
134 }
135
136 dev_info(&data->spi->dev,
137 "MCU Firm Rev : Old = %8u, New = %8u\n",
138 data->cur_firm_rev,
139 data->sensorhub_info->fw_rev);
140
141 if (data->cur_firm_rev != data->sensorhub_info->fw_rev)
142 return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
143
144 return SSP_FW_DL_STATE_NONE;
145 }
146
ssp_reset_mcu(struct ssp_data * data)147 static void ssp_reset_mcu(struct ssp_data *data)
148 {
149 ssp_enable_mcu(data, false);
150 ssp_clean_pending_list(data);
151 ssp_toggle_mcu_reset_gpio(data);
152 ssp_enable_mcu(data, true);
153 }
154
ssp_wdt_work_func(struct work_struct * work)155 static void ssp_wdt_work_func(struct work_struct *work)
156 {
157 struct ssp_data *data = container_of(work, struct ssp_data, work_wdt);
158
159 dev_err(&data->spi->dev, "%s - Sensor state: 0x%x, RC: %u, CC: %u\n",
160 __func__, data->available_sensors, data->reset_cnt,
161 data->com_fail_cnt);
162
163 ssp_reset_mcu(data);
164 data->com_fail_cnt = 0;
165 data->timeout_cnt = 0;
166 }
167
ssp_wdt_timer_func(struct timer_list * t)168 static void ssp_wdt_timer_func(struct timer_list *t)
169 {
170 struct ssp_data *data = from_timer(data, t, wdt_timer);
171
172 switch (data->fw_dl_state) {
173 case SSP_FW_DL_STATE_FAIL:
174 case SSP_FW_DL_STATE_DOWNLOADING:
175 case SSP_FW_DL_STATE_SYNC:
176 goto _mod;
177 }
178
179 if (data->timeout_cnt > SSP_LIMIT_TIMEOUT_CNT ||
180 data->com_fail_cnt > SSP_LIMIT_RESET_CNT)
181 queue_work(system_power_efficient_wq, &data->work_wdt);
182 _mod:
183 mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
184 }
185
ssp_enable_wdt_timer(struct ssp_data * data)186 static void ssp_enable_wdt_timer(struct ssp_data *data)
187 {
188 mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
189 }
190
ssp_disable_wdt_timer(struct ssp_data * data)191 static void ssp_disable_wdt_timer(struct ssp_data *data)
192 {
193 del_timer_sync(&data->wdt_timer);
194 cancel_work_sync(&data->work_wdt);
195 }
196
197 /**
198 * ssp_get_sensor_delay() - gets sensor data acquisition period
199 * @data: sensorhub structure
200 * @type: SSP sensor type
201 *
202 * Returns acquisition period in ms
203 */
ssp_get_sensor_delay(struct ssp_data * data,enum ssp_sensor_type type)204 u32 ssp_get_sensor_delay(struct ssp_data *data, enum ssp_sensor_type type)
205 {
206 return data->delay_buf[type];
207 }
208 EXPORT_SYMBOL_NS(ssp_get_sensor_delay, "IIO_SSP_SENSORS");
209
210 /**
211 * ssp_enable_sensor() - enables data acquisition for sensor
212 * @data: sensorhub structure
213 * @type: SSP sensor type
214 * @delay: delay in ms
215 *
216 * Returns 0 or negative value in case of error
217 */
ssp_enable_sensor(struct ssp_data * data,enum ssp_sensor_type type,u32 delay)218 int ssp_enable_sensor(struct ssp_data *data, enum ssp_sensor_type type,
219 u32 delay)
220 {
221 int ret;
222 struct ssp_instruction to_send;
223
224 to_send.a = cpu_to_le32(delay);
225 to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
226 to_send.c = data->batch_opt_buf[type];
227
228 switch (data->check_status[type]) {
229 case SSP_INITIALIZATION_STATE:
230 /* do calibration step, now just enable */
231 case SSP_ADD_SENSOR_STATE:
232 ret = ssp_send_instruction(data,
233 SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD,
234 type,
235 (u8 *)&to_send, sizeof(to_send));
236 if (ret < 0) {
237 dev_err(&data->spi->dev, "Enabling sensor failed\n");
238 data->check_status[type] = SSP_NO_SENSOR_STATE;
239 goto derror;
240 }
241
242 data->sensor_enable |= BIT(type);
243 data->check_status[type] = SSP_RUNNING_SENSOR_STATE;
244 break;
245 case SSP_RUNNING_SENSOR_STATE:
246 ret = ssp_send_instruction(data,
247 SSP_MSG2SSP_INST_CHANGE_DELAY, type,
248 (u8 *)&to_send, sizeof(to_send));
249 if (ret < 0) {
250 dev_err(&data->spi->dev,
251 "Changing sensor delay failed\n");
252 goto derror;
253 }
254 break;
255 default:
256 data->check_status[type] = SSP_ADD_SENSOR_STATE;
257 break;
258 }
259
260 data->delay_buf[type] = delay;
261
262 if (atomic_inc_return(&data->enable_refcount) == 1)
263 ssp_enable_wdt_timer(data);
264
265 return 0;
266
267 derror:
268 return ret;
269 }
270 EXPORT_SYMBOL_NS(ssp_enable_sensor, "IIO_SSP_SENSORS");
271
272 /**
273 * ssp_change_delay() - changes data acquisition for sensor
274 * @data: sensorhub structure
275 * @type: SSP sensor type
276 * @delay: delay in ms
277 *
278 * Returns 0 or negative value in case of error
279 */
ssp_change_delay(struct ssp_data * data,enum ssp_sensor_type type,u32 delay)280 int ssp_change_delay(struct ssp_data *data, enum ssp_sensor_type type,
281 u32 delay)
282 {
283 int ret;
284 struct ssp_instruction to_send;
285
286 to_send.a = cpu_to_le32(delay);
287 to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
288 to_send.c = data->batch_opt_buf[type];
289
290 ret = ssp_send_instruction(data, SSP_MSG2SSP_INST_CHANGE_DELAY, type,
291 (u8 *)&to_send, sizeof(to_send));
292 if (ret < 0) {
293 dev_err(&data->spi->dev, "Changing sensor delay failed\n");
294 return ret;
295 }
296
297 data->delay_buf[type] = delay;
298
299 return 0;
300 }
301 EXPORT_SYMBOL_NS(ssp_change_delay, "IIO_SSP_SENSORS");
302
303 /**
304 * ssp_disable_sensor() - disables sensor
305 *
306 * @data: sensorhub structure
307 * @type: SSP sensor type
308 *
309 * Returns 0 or negative value in case of error
310 */
ssp_disable_sensor(struct ssp_data * data,enum ssp_sensor_type type)311 int ssp_disable_sensor(struct ssp_data *data, enum ssp_sensor_type type)
312 {
313 int ret;
314 __le32 command;
315
316 if (data->sensor_enable & BIT(type)) {
317 command = cpu_to_le32(data->delay_buf[type]);
318
319 ret = ssp_send_instruction(data,
320 SSP_MSG2SSP_INST_BYPASS_SENSOR_RM,
321 type, (u8 *)&command,
322 sizeof(command));
323 if (ret < 0) {
324 dev_err(&data->spi->dev, "Remove sensor fail\n");
325 return ret;
326 }
327
328 data->sensor_enable &= ~BIT(type);
329 }
330
331 data->check_status[type] = SSP_ADD_SENSOR_STATE;
332
333 if (atomic_dec_and_test(&data->enable_refcount))
334 ssp_disable_wdt_timer(data);
335
336 return 0;
337 }
338 EXPORT_SYMBOL_NS(ssp_disable_sensor, "IIO_SSP_SENSORS");
339
ssp_irq_thread_fn(int irq,void * dev_id)340 static irqreturn_t ssp_irq_thread_fn(int irq, void *dev_id)
341 {
342 struct ssp_data *data = dev_id;
343
344 /*
345 * This wrapper is done to preserve error path for ssp_irq_msg, also
346 * it is defined in different file.
347 */
348 ssp_irq_msg(data);
349
350 return IRQ_HANDLED;
351 }
352
ssp_initialize_mcu(struct ssp_data * data)353 static int ssp_initialize_mcu(struct ssp_data *data)
354 {
355 int ret;
356
357 ssp_clean_pending_list(data);
358
359 ret = ssp_get_chipid(data);
360 if (ret != SSP_DEVICE_ID) {
361 dev_err(&data->spi->dev, "%s - MCU %s ret = %d\n", __func__,
362 ret < 0 ? "is not working" : "identification failed",
363 ret);
364 return ret < 0 ? ret : -ENODEV;
365 }
366
367 dev_info(&data->spi->dev, "MCU device ID = %d\n", ret);
368
369 /*
370 * needs clarification, for now do not want to export all transfer
371 * methods to sensors' drivers
372 */
373 ret = ssp_set_magnetic_matrix(data);
374 if (ret < 0) {
375 dev_err(&data->spi->dev,
376 "%s - ssp_set_magnetic_matrix failed\n", __func__);
377 return ret;
378 }
379
380 data->available_sensors = ssp_get_sensor_scanning_info(data);
381 if (data->available_sensors == 0) {
382 dev_err(&data->spi->dev,
383 "%s - ssp_get_sensor_scanning_info failed\n", __func__);
384 return -EIO;
385 }
386
387 data->cur_firm_rev = ssp_get_firmware_rev(data);
388 dev_info(&data->spi->dev, "MCU Firm Rev : New = %8u\n",
389 data->cur_firm_rev);
390
391 return ssp_command(data, SSP_MSG2SSP_AP_MCU_DUMP_CHECK, 0);
392 }
393
394 /*
395 * sensorhub can request its reinitialization as some brutal and rare error
396 * handling. It can be requested from the MCU.
397 */
ssp_refresh_task(struct work_struct * work)398 static void ssp_refresh_task(struct work_struct *work)
399 {
400 struct ssp_data *data = container_of((struct delayed_work *)work,
401 struct ssp_data, work_refresh);
402
403 dev_info(&data->spi->dev, "refreshing\n");
404
405 data->reset_cnt++;
406
407 if (ssp_initialize_mcu(data) >= 0) {
408 ssp_sync_available_sensors(data);
409 if (data->last_ap_state != 0)
410 ssp_command(data, data->last_ap_state, 0);
411
412 if (data->last_resume_state != 0)
413 ssp_command(data, data->last_resume_state, 0);
414
415 data->timeout_cnt = 0;
416 data->com_fail_cnt = 0;
417 }
418 }
419
ssp_queue_ssp_refresh_task(struct ssp_data * data,unsigned int delay)420 int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay)
421 {
422 cancel_delayed_work_sync(&data->work_refresh);
423
424 return queue_delayed_work(system_power_efficient_wq,
425 &data->work_refresh,
426 msecs_to_jiffies(delay));
427 }
428
429 static const struct of_device_id ssp_of_match[] = {
430 {
431 .compatible = "samsung,sensorhub-rinato",
432 .data = &ssp_rinato_info,
433 }, {
434 .compatible = "samsung,sensorhub-thermostat",
435 .data = &ssp_thermostat_info,
436 },
437 {},
438 };
439 MODULE_DEVICE_TABLE(of, ssp_of_match);
440
ssp_parse_dt(struct device * dev)441 static struct ssp_data *ssp_parse_dt(struct device *dev)
442 {
443 struct ssp_data *data;
444
445 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
446 if (!data)
447 return NULL;
448
449 data->mcu_ap_gpiod = devm_gpiod_get(dev, "mcu-ap", GPIOD_IN);
450 if (IS_ERR(data->mcu_ap_gpiod))
451 return NULL;
452
453 data->ap_mcu_gpiod = devm_gpiod_get(dev, "ap-mcu", GPIOD_OUT_HIGH);
454 if (IS_ERR(data->ap_mcu_gpiod))
455 return NULL;
456
457 data->mcu_reset_gpiod = devm_gpiod_get(dev, "mcu-reset",
458 GPIOD_OUT_HIGH);
459 if (IS_ERR(data->mcu_reset_gpiod))
460 return NULL;
461
462 data->sensorhub_info = device_get_match_data(dev);
463
464 dev_set_drvdata(dev, data);
465
466 return data;
467 }
468
469 /**
470 * ssp_register_consumer() - registers iio consumer in ssp framework
471 *
472 * @indio_dev: consumer iio device
473 * @type: ssp sensor type
474 */
ssp_register_consumer(struct iio_dev * indio_dev,enum ssp_sensor_type type)475 void ssp_register_consumer(struct iio_dev *indio_dev, enum ssp_sensor_type type)
476 {
477 struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
478
479 data->sensor_devs[type] = indio_dev;
480 }
481 EXPORT_SYMBOL_NS(ssp_register_consumer, "IIO_SSP_SENSORS");
482
ssp_probe(struct spi_device * spi)483 static int ssp_probe(struct spi_device *spi)
484 {
485 int ret, i;
486 struct ssp_data *data;
487
488 data = ssp_parse_dt(&spi->dev);
489 if (!data) {
490 dev_err(&spi->dev, "Failed to find platform data\n");
491 return -ENODEV;
492 }
493
494 ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_NONE,
495 sensorhub_sensor_devs,
496 ARRAY_SIZE(sensorhub_sensor_devs), NULL, 0, NULL);
497 if (ret < 0) {
498 dev_err(&spi->dev, "mfd add devices fail\n");
499 return ret;
500 }
501
502 spi->mode = SPI_MODE_1;
503 ret = spi_setup(spi);
504 if (ret < 0) {
505 dev_err(&spi->dev, "Failed to setup spi\n");
506 return ret;
507 }
508
509 data->fw_dl_state = SSP_FW_DL_STATE_NONE;
510 data->spi = spi;
511 spi_set_drvdata(spi, data);
512
513 mutex_init(&data->comm_lock);
514
515 for (i = 0; i < SSP_SENSOR_MAX; ++i) {
516 data->delay_buf[i] = SSP_DEFAULT_POLLING_DELAY;
517 data->batch_latency_buf[i] = 0;
518 data->batch_opt_buf[i] = 0;
519 data->check_status[i] = SSP_INITIALIZATION_STATE;
520 }
521
522 data->delay_buf[SSP_BIO_HRM_LIB] = 100;
523
524 data->time_syncing = true;
525
526 mutex_init(&data->pending_lock);
527 INIT_LIST_HEAD(&data->pending_list);
528
529 atomic_set(&data->enable_refcount, 0);
530
531 INIT_WORK(&data->work_wdt, ssp_wdt_work_func);
532 INIT_DELAYED_WORK(&data->work_refresh, ssp_refresh_task);
533
534 timer_setup(&data->wdt_timer, ssp_wdt_timer_func, 0);
535
536 ret = request_threaded_irq(data->spi->irq, NULL,
537 ssp_irq_thread_fn,
538 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
539 "SSP_Int", data);
540 if (ret < 0) {
541 dev_err(&spi->dev, "Irq request fail\n");
542 goto err_setup_irq;
543 }
544
545 /* Let's start with enabled one so irq balance could be ok */
546 data->shut_down = false;
547
548 /* just to avoid unbalanced irq set wake up */
549 enable_irq_wake(data->spi->irq);
550
551 data->fw_dl_state = ssp_check_fwbl(data);
552 if (data->fw_dl_state == SSP_FW_DL_STATE_NONE) {
553 ret = ssp_initialize_mcu(data);
554 if (ret < 0) {
555 dev_err(&spi->dev, "Initialize_mcu failed\n");
556 goto err_read_reg;
557 }
558 } else {
559 dev_err(&spi->dev, "Firmware version not supported\n");
560 ret = -EPERM;
561 goto err_read_reg;
562 }
563
564 return 0;
565
566 err_read_reg:
567 free_irq(data->spi->irq, data);
568 err_setup_irq:
569 mutex_destroy(&data->pending_lock);
570 mutex_destroy(&data->comm_lock);
571
572 dev_err(&spi->dev, "Probe failed!\n");
573
574 return ret;
575 }
576
ssp_remove(struct spi_device * spi)577 static void ssp_remove(struct spi_device *spi)
578 {
579 struct ssp_data *data = spi_get_drvdata(spi);
580
581 if (ssp_command(data, SSP_MSG2SSP_AP_STATUS_SHUTDOWN, 0) < 0)
582 dev_err(&data->spi->dev,
583 "SSP_MSG2SSP_AP_STATUS_SHUTDOWN failed\n");
584
585 ssp_enable_mcu(data, false);
586 ssp_disable_wdt_timer(data);
587
588 ssp_clean_pending_list(data);
589
590 free_irq(data->spi->irq, data);
591
592 del_timer_sync(&data->wdt_timer);
593 cancel_work_sync(&data->work_wdt);
594
595 mutex_destroy(&data->comm_lock);
596 mutex_destroy(&data->pending_lock);
597
598 mfd_remove_devices(&spi->dev);
599 }
600
ssp_suspend(struct device * dev)601 static int ssp_suspend(struct device *dev)
602 {
603 int ret;
604 struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
605
606 data->last_resume_state = SSP_MSG2SSP_AP_STATUS_SUSPEND;
607
608 if (atomic_read(&data->enable_refcount) > 0)
609 ssp_disable_wdt_timer(data);
610
611 ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_SUSPEND, 0);
612 if (ret < 0) {
613 dev_err(&data->spi->dev,
614 "%s SSP_MSG2SSP_AP_STATUS_SUSPEND failed\n", __func__);
615
616 ssp_enable_wdt_timer(data);
617 return ret;
618 }
619
620 data->time_syncing = false;
621 disable_irq(data->spi->irq);
622
623 return 0;
624 }
625
ssp_resume(struct device * dev)626 static int ssp_resume(struct device *dev)
627 {
628 int ret;
629 struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
630
631 enable_irq(data->spi->irq);
632
633 if (atomic_read(&data->enable_refcount) > 0)
634 ssp_enable_wdt_timer(data);
635
636 ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_RESUME, 0);
637 if (ret < 0) {
638 dev_err(&data->spi->dev,
639 "%s SSP_MSG2SSP_AP_STATUS_RESUME failed\n", __func__);
640 ssp_disable_wdt_timer(data);
641 return ret;
642 }
643
644 /* timesyncing is set by MCU */
645 data->last_resume_state = SSP_MSG2SSP_AP_STATUS_RESUME;
646
647 return 0;
648 }
649
650 static DEFINE_SIMPLE_DEV_PM_OPS(ssp_pm_ops, ssp_suspend, ssp_resume);
651
652 static struct spi_driver ssp_driver = {
653 .probe = ssp_probe,
654 .remove = ssp_remove,
655 .driver = {
656 .pm = pm_sleep_ptr(&ssp_pm_ops),
657 .of_match_table = ssp_of_match,
658 .name = "sensorhub"
659 },
660 };
661
662 module_spi_driver(ssp_driver);
663
664 MODULE_DESCRIPTION("ssp sensorhub driver");
665 MODULE_AUTHOR("Samsung Electronics");
666 MODULE_LICENSE("GPL");
667